Patent GB-124864-A (GB)
Title: Improvements in and relating to Margin Controlling Devices for Typewriting Machines.
IPC: B41J29/50
Filed: 1918-03-08
Abstract: 124,864. Marks, E. C. R., (Royal Typewriter Co.). March 8, 1918. Margin stops; line-locking devices; alarms.- In front-strike type-lever machines, the margincontrolling devices comprise two stop-rails, located near the front of the carriage and separated by a space for the passage of the type-levers, the arrangement providing for full visibility of the printing line. In the machine shown, the two rails 27, 28 are mounted on the top plate 25 of the framework 1, the rail 27 carrying an adjustable margin-stop 74 which co-operates with a stop 75 on the carriage 3, and the rail 28 carrying an adjustable line-locking and bell-ringer stop 29 which co-operates with a stop 30 on the carriage. The aliner 20, Fig. 1, for the type-levers 8 is arranged midway between the inner ends of the rails. The rail 28 is trunnioned in blocks 31 and is provided with a depending arm 33, Fig. 5, which carries a bell hammer 54 and is connected by a link 45 to pivoted locking-blade 38 adapted to engage lugs 40 on the key-levers 10. The stop-member 30 is provided with stops 64, 65 adapted, in the normal and the shift-positions respectively of the carriage, to engage stops 62, 63 on the stopmember 29. The stop-member 29 consists of a sleeve provided with a locking-dog 56. The stops 64 is formed on the member 30, and the stop 65 is pivoted on the member 30 and is pressed forwards by a spring. The member 30 is pivoted on a vertical pin 66 on a plate 67 which is pivoted at 70 to the end of the carriage. Normally, a spring 71 holds the plate against a stop 72, and a spring 69 holds arms 68, on the member 30, against the plate. The stops 64, 65 are bevelled on the left side. When the carriage is approaching the lineend position, the stop 64 or 65 engages the stop 62 and causes the rail to rock, the hammer 54 being thereby moved away from the bell, and the locking-blade 38 also being moved, but not far enough to engage the lugs 40. When the stop 64 or 65 clears the stop 62, the rail is returned by a spring 37 and the bell is struck. The stop 64 or 65 next engages the stop 63 and causes the rail to rock far enough to cause the locking-blade to engage the lugs and thereby lock the keyboard. For releasing the lock, there is provided a pushkey 49 adapted to rock a bell-crank 47 which is connected by a link 48 to the link 45. On pushing in the key, the link 45 is lifted, and the end enters a slot 34 in the arm 33 and permits a spring to return the locking-blade. In returning the carriage, the pivot 66 enables the stop 64 or 65 to ride past the stops 62, 63. If the carriage is shifted from the normal to the shift position when the stop 65 is in engagement with the stop 62 or 63, the plate 67 turns about the pivot 70 to permitof the shift movement, and the rail 28 is locked far enough to cause the locking-blade to lock the keyboard. If the carriage is shifted from the shift to the normal position when the stop 64 is in engagement with the stop 62 or 63, the stop 65 yields and permits of the shift movement ; further, if the stop 64 is in engagement with the stop 63, the locking-blade is released. In a modification, Fig. 16, the stops 95, corresponding to the stops 62, 63, are pivoted on the stop-member 93 and are held by springs 97 against pins 98, the arrangement enabling the stops 99 on the carriage to ride past the stops 95 when the carriage is returned. The stop-member 74 is provided with a stop 77 consisting of a screw which co-operates in either the normal or the shift position of the carriage with the stop 75. The stop 75 is formed with slots 84, Fig. 9, engaging pins 85 on the carriage, and is held in the forward position by a spring 86. The stop 75 can be retracted by means of a finger-piece 89 to permit of writing in the margin; or a lever may be provided for retracting the stop. The stop 75 and the stop-member 77 are provided with bevelled parts 87, 88 respectively, for causing the stop 75 to be retracted when the carriage is returned from an over-themargin position. The stop-member 74 is locked by a dog 79 formed at the top and bottom with slotted ears 80 engaging a pin 81, a spring 82, Fig. 9, on the pin holding the dog in engagement with the rail. In pushing the dog inwards to release the stop-member, the end of the dog rides along an incline 76<a>, and the stop-member is pushed to the left and is locked in that position when the dog is released, the pin 81 being then in the middle of the slots. When the stop 75 engages the stop 77, the stop-member can move one letter-space to the right before the carriage is arrested. The rails 27, 28 may be graduated to the left from 0 to 30 and from 50 to 80 respectively, the graduations from 30 to 50 being usually unnecessary.